Enter a batter's singles, doubles, triples, home runs, and at-bats into this Slugging Percentage Calculator to get their SLG — the number of bases earned per at-bat. You'll also see a performance rating and a visual breakdown of how each hit type contributes to the total bases.
Slugging Percentage (SLG)
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Total Bases
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Total Hits
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Performance Rating
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Slugging percentage is a measure of a batter's productivity and power. It equals the total number of bases a player earns divided by their total at-bats. Unlike batting average, it gives extra weight to extra-base hits, making it a better indicator of a hitter's power.
SLG = (1B + 2×2B + 3×3B + 4×HR) / AB. Each single counts as 1 base, each double as 2, each triple as 3, and each home run as 4. Divide the total bases by at-bats to get the slugging percentage.
A SLG above .500 is considered excellent and is typical of elite power hitters. A SLG between .400 and .500 is above average for MLB players. Anything below .300 is generally considered poor, while .350–.400 is around the league average.
Batting average simply counts each hit equally (hits divided by at-bats), whereas slugging percentage weights each hit by the number of bases earned. A player with many home runs will have a much higher SLG than batting average, reflecting their extra power.
Technically yes, though it is extremely rare. A slugging percentage of 1.000 would mean a batter earages one base per at-bat on average. If a batter hit a home run in every at-bat, their SLG would be 4.000 — the theoretical maximum.
Slugging percentage is designed to measure a batter's power hitting ability specifically. Walks are excluded because they don't reflect the batter's ability to make contact and hit for bases. On-base percentage (OBP) is the stat that accounts for walks.
Isolated Power (ISO) measures a batter's raw power by subtracting batting average from slugging percentage: ISO = SLG − BA. It strips away singles to show only the extra-base contribution. An ISO above .200 is considered very good for a power hitter.
Barry Bonds holds the MLB record for highest single-season slugging percentage at .8631 in 2001. Babe Ruth holds second place with .8474 in 1920. Among career records, Babe Ruth leads all time with a career SLG of .6897.